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W. H. THOMPSON. 4

NUT LOOK.

Patented Oct. 19, 1886.

NITE rarns F F ICE,

\VILLIAM H. THOMPSON, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE- HALF TOIRVING S. GORDON AND WVILLIALWI E. KURTZ, OF SAME PLACE.

NUT-LOCK.

SPECIFICATION formingpart of Letters Patent No. 351,223, dated October19, 1886.

Application filed June 1, 1886.

To all whom it may concern:

Be it known that I, \VILLLUI H. Tuone son, a citizen of the UnitedStates, residing at Indianapolis, in the county of Marion and State ofIndiana, have invented a newand useful Improvement in Nut-Locks, ofwhich the following is a specification.

My invention relates to an improved nutlock of that class in which thenut is secured against turning off by a key, which is driven between thenut and its washer after the nut has been screwed onto the bolt.

The accompanying drawings illustrate my invention.

Figure l is a side elevation. Fig. 2 is a section at a, Fig. 1. Figs. 3and 4 represent ele vations of opposite sides of the key.

. My nut-lock is shown in the drawings as applied io theordinaryjoint-bolts ofa rail-joint.

A is the rail, Bthe fish-bar, and c c are the bolts.

D D are a pair of rectangular washers, con nected by a bar, 6 andadapted to he slipped upon the bolts 0 c and to rest against thetishbar. Said washers are each provided on their outer face with agroove, f, the portion h remaining above the groove being thinner thanthe rest of the washer.

Eis thekey for securing the nut on the bolt. Said key consists of acentral web, 1', having on one'sidea rib, j, adapted to fit loosely inthe groove f on the washer, and a flange, lc, projecting laterally oneach side of the web, so as to engage on one side the upper edge of thewasher and on the other side the upper edge of the nut Z. The thicknessof web '11 corresponds to the difference between the thickness of themain portion of the washer and portion h. The web 2' in its lower edge anotch, in, which registers with the bolt-hole in the washer. The flange7c is extended be yond the webt', as at a, and said extended end is madethinner than the rest of theflange, so that it may be bent down over thecorner of the washer, as shown in dotted lines in Fig. 1. The oppositeend of the key is made solid Serial No. 203,728. fNomodel.)

the full thickness ofthe width of flange k, and thus forms a suitablehead to receive the blows of a hammer for driving the key in. Said headalso forms ashoulder,0,whiehflts against The washers D D are slippedupon the proj ect- 5 5 ing ends of the joint-bolts c c; The nuts arethen screwed upon said bolts close against the washers. Key E is theninserted, from the side toward which the nut has been turned on,

between the back of the nut and the thin portion ot'the washer, ribjentering gro0vef,and the key is driven until shoulder 0 comes in contactwith the side of the nut. As the key passes over that portion of thethreads of the belt which is in its path, the bolt is forced slightlydownward and the threads are battered down. The slight recoil of thebolt and threads causes the bolt to engagethe notch m, and thus preventsthe withdrawal of the key until some considerableforce isapplied againstthe lugp. For still greater security,the eXten sion in of flange It maybe bent down over the washer,as before described. It will be observrdthat, the key having been inserted from the side toward which the notwas turned when screwed on, any tendency of the nut to turn in theopposite direction operates to draw the key in rather than to push itout along the path in which it is forced to move, if it moves at all, bythe interlocking of rib and groovef.

I claim as my inve.ntion The above described nut-lork, consisting of thegrooved rectangular washer having the thin portion h, the key E, havingthe central web, 1, notch in, rib j, flange 7c, and h1g1), all

combined and arranged to co-operate with a bolt and nut, as and for thepurpose specified.

\VILLIAM H. THOMPSON.

\Vituesses:

H. P. Hoop, V. M. H001).

